Field winding



May 31, 1927.

L. M PERKINS FIELD WINDING Filed April 13, 1922 Patented May 31, 1927.

I UNITED STATES PATENT OFFICE.

LAURENCE M. PERKINS, OF SYRACUSE, NEW YORK, ASSIGNOR OF ONE-HALF TOOWEN- DYNETO CORPORATION, OF SYRACUSE, NEW YORK, ACOR-PORATION OF NEWYORK.

FIELD WINDING.

App1ication filed April 13, 1922.

This invention relates to certain improvementsin field windings forelectric machines, particularly of the motor, generator or motorgenerator type, -and'the process for producing the same.

An object of the invention is the production of an electrical machine ofthe multipolar type in which a continuous conductor passes thru each ofthe inter polar soaces substantially axially in such a way as to givethe polesalternately north and south polarity.

Another object of the invention is the production of afield winding fora multi-polar machine in a single operation.

Another object is the elimination of soldered joints in the fieldwinding. A turtherobject is the production of all the field windings fora multi-polar machine from a continuous conductor.

Other objects and advantages relate to the details of construction andform of the field winding, and the process used in producing the same,all as will more fully appear from the following description taken inconnection with the accompanying drawings, in which:

Figure '1 is an end elevation oi a field winding of my invention.

Figure '2 is a side elevation of the same.

Figure 3 illustrates an apparatus used in manufacturing the winding ofmy invention.

Figure 4t is a side elevation of the same apparatus, illustrating themethod of rolling the inter-fitting'layers ofthe conductor together toform the completed winding.

7 Thedrawings illustrate a field winding for a six-pole machine, but myinvention in- .cludes a winding for any multi-polar machine and bymulti-polar, I mean any ma chine having more than two poles.

The completed winding comprises a series of integrally connected fieldwindings of U shaped form, alternate U-shaped portions opening inopposite directions. The entire structure in lateral cross section ispreferably substantially circular, and in lateral elevation constitutesa series of S-shaped portions. The side walls of the U-shaped recessesmay preferably be substantially parallel, and extend substantiallyparallel with the axis of the winding when considered upon the innercircumference of the completed field winding, so that the U-shapedrecesses are capable of receiving a pole piece Serial No. 552,311.

be vformed of a double, triple, or other plural strap constituting ineffect a single, continuous conductor which should be suitably insulatedand wound as illustrated, .to produce a laterally circular structureformed oi a plurality of longitudinally U-shaped laterally curved polepiece receiving windings 2., each separate pole piece winding consistingof a plurality of overlying or telescoped U-shaped thicknesses of saidribbon, wire, or strap.

Each side of any one of the U-shaped sections constitutes a side of theadjacent U-shaped section, said overlying parallel extending layers ofsaid strap winding back and forth thru the inter-polar spaces andextending partially around three sides only of each pole piece. '4

Various methods of manufacturing this field winding may be devised, onesatisfactory one being illustrated in Figures 3 and 4 in which a supportor base 23 carries a series of shaping pins, the relative arrangement,number and size of said pins dependent on the size of the field windingand the number oi pole receiving ii-shaped spaces to be formed.

The illustration discloses a board equipped with pins suitable forforming the six pole field winding disclosed.

Various sizes of pins are needed to form the exterior, interior andintermediate layers of the continuous conductor as formed in thecompleted winding. The pins are arranged in two rows -1- and 5-staggered with respect to each other, and each row comprises a pluralityof series of pins, the pins of each series being the same size, and eachseries of pins differing in size from the pins of the other series ofthe same row. One row of pins is arranged in a series oi decreasing sizefrom end to end, and the other row in a series of increasing size fromend to end from the same end toward the other end, so that the smallestpins of one row are arranged in staggered relation with respect to thelarg'est pins in the other row. Each row preferably contains the samenumber of series and the same number of pins in each series, the sizebeing such as to form the interfitting layers of the Continuousconductor, as illustrated. Specifically the row 4- comprises two largepins -6-, three somewhat smaller pins 7, three still smaller pins -8,three still smaller pins -9 and three pins 10 smaller than the pins 9.The row comprises the same series of pins and the same size pins in eachseries beginning at the opposite end of the row with two large pins l1corresponding to the pins -6, three smaller pins -12 corresponding tothe pins -7-, three still smaller pins --13 corresponding to the pins-8, and three still smaller pins 14 corresponding to the pins -9, andthree still smaller pins -l5 corresponding to the pins has been woundback and forth around these pins as illustrated, first around one of thesmall pins 15 and then around one of the pins G, and the continuousconductor has been formed into the oppositely opening loop shapedstructure illustrated in Figure 3 starting at one end as the left handend of the drawing, the loop formed around the first pin l5 is byrolling the strap into laterally circular form, rolled into the loopformed around the first pin l4 and by continuing the rolling process,the loop formed around the first pin 6 forms a layer outside of thelayer or loop formed around the second pin 7, and so forth, until theentire continuous conductor is rolled into the form shown in Figure 2,the ends of the conductor constituting the terminals or leads '1(3 and-17. This method of producing the field winding consisting in formingthe strap, ribbon or wire into loops of proper size and in properrelation, and then rolling the loops of one size into the loops of thenext size or about \Vhen the conductor 10--c the loops of the next sizeso as to form the layers of the completed winding, is efficient andcomparatively simple, and inexpensive in the production of a novel andhighly efficient field winding Although I have shown and described aspecific construction as illustrative of a preferred embodiment of myinvention, and as illustrative of a field winding adapted to aparticular multi-polar machine, I do not desire to limit myself to theshape or size of the winding, or the details of its form orconstruction'or to the particular number of poles for which the same maybe designed, as various changes may be made in the form or constructionand arrangement, without departing from the invention as set forth inthe appended claims.

I claim:

.1. A field winding for a multi-polar machine substantially circular inlateral cross section and consisting of a series of Ion itudinallyarranged sinuous U-shaped p0 ereceiving layers of conductor eachtransversely curved and arranged substantially parallelto the operativeaxis of the machine, alternate U-shaped layers opening in oppositedirections.

2. A field winding for a multi-polar machine, such winding formed of acontinuous conductor wound to form a series of integrally connectedtransversely curved U- shaped pole-receiving windings, the longitudinalaxis of each U-shaped pole receiving winding and the operative axis ofthe machine being in substantially the same plane, alternate U-shapedwindings opening in 0pposite directions.

3. A field winding for a multi-polar machine consisting of a continuoustransversely curved multiconductor sinuous winding having preformed polereceiving cavities therein.

In witness whereof I have hereunto set my hand this 3d day of April,1922.

LAURENCE M. PERKINS.

